I agree it would be useful. Members already answer a lot of threads on the subject of inherited/found stamps, often relating to possible worth, and also discussing the basics of stamp collecting for newbies. There's probably a wealth of information on the forum that could be edited down to make a basic guide as you suggest. I think it would have to fairly basic as if you go into too much detail, the subjects can get contentious
and also we are an international forum and not everyone speaks English as their first language.
It would be a lot of work for someone, or a few working together, to write up. But then it might save time for members answering newbie questions.
Having said that, asking newbie questions is a great way for someone to become engaged and welcomed into the forum, and the range of answers they receive does give them a more personal introduction to the hobby, so I wouldn't ever want to discourage it altogether.